What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?

Read the following statements and find out the incorrect statements with reference to agarose gel electrophoresis.

(i) Now-a-days the most commonly used matrix is agarose which is a synthetic polymer extracted from sea weeds.

(ii) Larger the fragment size, the farther it moves.

(iii) We can not see pure DNA in UV light without staining.

(iv) DNA fragments separate (resolve) according to their size through sieving effect provided by the agarose gel